Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013	Jan. 31, 2014
Disclosure Income Taxes Additional Information [Abstract]
Income tax benefit	$ (1,768)	$ (2,338)	$ (1,942)	$ (1,770)
Effective tax rate	(14.70%)	(10.90%)	(22.10%)	(8.20%)
Period specific items benefit			(3,174)
Effective income tax rate forecast			10.00%
U.S. federal statutory rate			35.00%
Income taxes associated with uncertain income tax positions	17,937		17,937
Liability for uncertain tax positions, current	372		372
Income tax liability	$ 17,565		$ 17,565		$ 18,431